In my opinion I think artless proof is more important than artistic proof.Artless proof is a factual arguement where you may have pre-exisisting physical evidence on hand to back up your arguement.Artistic proof can be can be less assuring because you're creating an arguement based off of little evidence to back it up.When you have facts and statistics to back up an arguement of yours like a witness for example you're more likely to win an arguement opposed to someone who tries to come up with an arguement that could be a lie.